Answer:
t = 15
Explanation:
the midsegment WZ of a trapezoid is half the sum of the parallel bases
WZ=
← substitute values
- t + 35 =

- t + 35 =
= t + 5 ( add t to both sides )
35 = 2t + 5 ( subtract 5 from both sides )
30 = 2t ( divide both sides by 2 )
15 = t